I updated my templates fedora-26 to 27 and after to 28.
The docs are here: 
https://www.qubes-os.org/doc/template/fedora/upgrade-27-to-28/

About the conflict with dconf, I included -x dconf to the upgrade dnf command. 
After that I did: sudo dnf update --allowerasing --best 
--enablerepo=qubes-vm*-current-testing

So far, it is working ok.

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